Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c13708ca976152…

MALICIOUS

PDF

82.2 KB Created: 2021-03-24 04:56:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9214406c97da7eca3d99e7968a5d792 SHA-1: a66a1bb3478b460f248aa81481000fa8e1d37008 SHA-256: a2c13708ca97615277d9352ee1fdaa322458b77475589c6cb92a5b13bcd4a70c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, identified as a link farm, designed to redirect users to other PDF documents. The primary lure appears to be a search result for 'Darril Gibson security 401 pdf download', suggesting a phishing or scam attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/wix?keyword=darril+gibson+security%252B+401+pdf+download
    • https://werobezukivipa.weebly.com/uploads/1/3/4/3/134337965/92c8f80ef6.pdf
    • https://sabizedikidoxar.weebly.com/uploads/1/3/2/6/132681903/1926310.pdf
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/fupavoborovojar.pdf
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/9509807.pdf
    • https://wadonado.weebly.com/uploads/1/3/4/6/134677460/lebelamokob-livawonure-resafu-xilipovifudi.pdf
    • https://jagevugabawe.weebly.com/uploads/1/3/4/6/134631244/nexote.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_115981d2428349dc957fb865c3df6220.pdf?index=true
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_69a2a3357a5d406a8dd91bd4ff504d57.pdf?index=true
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_11a1695f275c4c43b705ed93fdbaa114.pdf?index=true
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_38485ffd9507410198dc6fce4d187e38.pdf?index=true
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_ce4156b1f69341049a4febef83e2da41.pdf?index=true
    • https://s3.amazonaws.com/sefabe/ar_reading_practice_quiz_answers.pdf
    • https://uploads.strikinglycdn.com/files/1d19dad4-3dc2-4412-bdf4-f367bd0eaaa4/how_much_does_it_cost_to_build_a_doghouse.pdf
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_b7607dc7381b43d0bf548f65a5a1e7a1.pdf?index=true
    • https://s3.amazonaws.com/jojitagifuva/rowofadi.pdf
    • https://s3.amazonaws.com/juwofuxufijup/acute_stroke_care_guidelines.pdf
    • https://s3.amazonaws.com/zarusegibitumet/skoda_fabia_2002_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/9098d9d0-031d-4ece-9357-9eef7eafa814/default_username_and_password_for_cisco_linksys_e4200_router.pdf
    • https://uploads.strikinglycdn.com/files/28d75f99-8648-41b6-8bd5-7bcee349fb0a/what_is_the_net_worth_of_andrew_wommack.pdf
    • https://s3.amazonaws.com/vebisop/88776877381.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001023e.bin
76c388d6cfe7e90a5df7d23cdafba0f3d3fd0bdc4fa32d9aadb7ed685882160e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 5936 bytes
font_01_sfnt_off000116aa.bin
e1d2b92c0d24d2c1defab4b3845bac486e29e33a01740c4b864aaa5c66dc1699		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 10876 bytes

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